Arena said he met with Nemeth and told him to think about it, but Nemeth said, "I don't need to think about it. I want the deal."
Arena denied offering Nemeth anything that he wasn't entitled to in the plea bargain.
According to evidence presented at his preliminary hearing last year, Nemeth was alone with Louis Oliver for about an hour the afternoon of May 23, 2012.
A San Diego police detective testified that Nemeth said he woke the child from a nap and found him to be a "little limp," then put him in a car seat while he tended to other children. Nemeth told investigators that when he
turned his attention back to Louis, he found him unresponsive and not breathing.
Rooney said Nemeth lied about when he called 911, dialing the emergency number only after he talked on the phone with his mother for four minutes.
The toddler was pronounced dead the next morning. Doctors testified that he had severe retinal hemorrhages and suffered non-accidental trauma.
Rooney said the defendant shook Louis about eight days before fatally injuring him, but the child survived that shaking.
Another San Diego police detective testified that Nemeth's adult daughter told investigators that her father had a temper and yelled at children at his daycare facility, where she also worked. She told police that her father
would become frustrated when babies cried, the detective said.
A former employee told authorities that she called Child Protective Services after seeing Nemeth push a boy down a hallway and press the boy's nose against a wall, a district attorney's investigator testified.
Testimony in the plea withdrawal motion is expected to wrap up on Thursday.
If the motion is denied, sentencing could follow.